Thursday, March 19, 2015

Circuit Edge-Triggered 555 Monostable Multivibrator Diagram

Robotronicdiagram. - Here is Circuit Edge-Triggered 555 Monostable Multivibrator Diagram like in figure 1 below. While the 555 oscillator IC is a very versatile device, it can also be quite tricky and solutions are not always obvious. Such is the case with this edge-triggered 555 monostable circuit. By differentiating the trigger signal, the monostable multivibrator times out normally regardless of the trigger signal length.

Circuit Diagram
Figure 1. Circuit Edge-Triggered 555 Monostable Multivibrator Diagram

Component List
  1. IC 555
  2. Resistors
  3. Capacitors
  4. Diodes

Circuit diagram like in figure 1 above is Circuit Edge-Triggered 555 Monostable Multivibrator Diagram. The circuit diagram above can describe as follow:

More than a capacitor

The classic differentiator circuit consists of a capacitor and resistor. In this way, the positive change in the trigger signal is coupled to the 555 via C2. When the trigger signal eventually resets, D2 is required to prevent the change in voltage from creating a substantial negative spike. While a negative transient of this nature is unlikely to cause damage, it could well cause temporary IC malfunction.

R-C timing circuit

C1 and the series resistance of R1 to R3 affect the timeout function. Circuit values may be selected per application requirements. This part of the circuit is fairly typical.

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